<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
   <h1>注册</h1>
   <form>
       用户名:<input type="text" name="username" placeholder="用户名"
        @blur="check()"> {{info}}<br>
       密码:<input type="password" name="password" placeholder="密码"><br>
       昵称:<input type="text" name="nick" placeholder="昵称"><br>
       年龄:<input type="text" name="age" placeholder="年龄"><br>
       <input type="button" value="注册" @click="reg()">
   </form>
<!--引入axios和vue-->
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.14/vue.js"></script>
<script>
    let v = new Vue({
        el:"form",
        data:{
            info:""
        },
        methods:{
            check:function (){
                let data = new  FormData(document.querySelector("form"));
                axios.post("/check",data).then(function (response) {
                    if(response.data==1){
                        v.info = "用户名可用";
                    }else{
                        v.info="用户名已存在";
                    }
                })
            },
            reg:function () {
                let data = new  FormData(document.querySelector("form"));
                axios.post("/reg",data).then(function (response) {
                    if(response.data==1){
                        alert("注册成功");
                        location.href="/";//location:地址栏对象，修改只为/,即返回index页面
                    }else if(response.data==2){
                        alert("用户名不可用")
                    }else{
                        alert("用户名或者密码")
                    }
                })
            }
        }
    })
</script>
</body>
</html>